Metronic 100 Pcs 9x12" White Poly Mailer Envelopes Shipping Bags with Self Adhesive, Waterproof and Tear-proof Postal Bags (White) PROVIDES CONFIDENTIALITY - These poly mailers were white outer surface, black inner lining, so it looks like light grey color not a true bright white. The Mailing Bags used of opaque materials convenient for protect your privacy with a professional appearance. SAVE YOUR TIME AND SHIPPING COST - The poly mailer bags are good acceptable thickness for shipping soft-goods, and they are light enough to safe you some money on weight for shipping. The white mailing bags have a peel-off strip that is very sticky that will seal the bag very well, it's quick seal, no licking or water needed. The poly mailer bags are a good strong plastic shipping bag. If you have many orders need to post everyday, these plastic mailing bags perfect for you! WIDELY USE - The 9x12 mailer bags are quite useful for soft items, such like T-shirts, blankets, scarves, or other non breakable items. They are definitely quite durable and the sticky strip sticks very well. WATER PROOF - The poly mailer are self-sealing for easy packing with a tamper-evident, super secure closure. Pressure sensitive adhesive provides a high strength, durable closure that is water and dirt resistant. The Plastic Mailing is thin, durable, and quite flexible, so they're very forgiving of weirdly-shaped contents, and it's easy to add in a bit of padding, like newspaper or bubble wrap, for extra protection. DURABLE PROTECTION - Top-quality poly mailers are tear and puncture resistant. Even though poly mailers don't offer interior cushioning, they are made to withstand the rigors of the shipping process. A poly mailer is usually made of polyethylene but can also be made of heavy-duty nylon fibers. Poly mailers are a great choice for their high-strength design that keeps contents secure against moisture, chemicals, tampering, puncturing and tearing. Top-quality poly mailers are tear and puncture resistant. Even though poly mailers don&#039;t offer interior cushioning, they are made to withstand the rigors of the shipping process. These poly mailers were white outer surface, black inner lining, so it looks like light grey color not a true bright white. The Mailing Bags used of opaque materials convenient for protect your privacy with a professional appearance. The poly mailer are self-sealing for easy packing with a tamper-evident, super secure closure. Pressure sensitive adhesive provides a high strength, durable closure that is water and dirt resistant. The Plastic Mailing is thin, durable, and quite flexible. The 9x12 mailer bags are quite useful for soft items, such like T-shirts, blankets, scarves, or other non breakable items. They are definitely quite durable and the sticky strip sticks very well.